The refractivity of natural hydrogen gas has been measured at eighteen wavelengths from 0.4047 to 1.6945 µm by means of a corner-reflector interferometer. The resulting refractivity at 0.5462252 µm, and at standard conditions, is 139.304 × 10<sup>−6</sup>. Sixteen points of our data are well fitted by the dispersion formula 10<sup>6</sup>(<i>n</i> − 1) = 21.113 + 12723.2/(111 − σ<sup>2</sup>), where σ is wave number in reciprocal micrometers. The combination of our data with recent measurements in the ultraviolet by Smith, Huber, and Parkinson is fitted by the formula 10<sup>6</sup>(<i>n</i> − 1) = [14895.6/(180.7 − σ<sup>2</sup>)] + [4903.7/(92 − σ<sup>2</sup>)]. Comparisons are made with the literature in respect to refractivity, dispersion, dielectric constant, molecular polarizability, Rayleigh scattering cross section, and Verdet constant.
© 1977 Optical Society of America
Edson R. Peck and Shiezen Huang , "Refractivity and dispersion of hydrogen in the visible and near infrared," J. Opt. Soc. Am. 67, 1550-1554 (1977)